#ifndef _PPC_PTRACE_H
#define _PPC_PTRACE_H

/*
 * This struct defines the way the registers are stored on the
 * kernel stack during a system call or other kernel entry.
 *
 * this should only contain volatile regs
 * since we can keep non-volatile in the thread_struct
 * should set this up when only volatiles are saved
 * by intr code.
 *
 * Since this is going on the stack, *CARE MUST BE TAKEN* to insure
 * that the overall structure is a multiple of 16 bytes in length.
 *
 * Note that the offsets of the fields in this struct correspond with
 * the PT_* values below.  This simplifies arch/ppc/kernel/ptrace.c.
 */

#ifndef __ASSEMBLY__
#define PPC_REG unsigned long

struct pt_regs {
    PPC_REG gpr[32];
    PPC_REG nip;
    PPC_REG msr;
    PPC_REG orig_gpr3;  /* Used for restarting system calls */
    PPC_REG ctr;
    PPC_REG link;
    PPC_REG xer;
    PPC_REG ccr;
    PPC_REG mq;     /* 601 only (not used at present) */
                    /* Used on APUS to hold IPL value. */
    PPC_REG trap;       /* Reason for being here */
    PPC_REG dar;        /* Fault registers */
    PPC_REG dsisr;
    PPC_REG result;     /* Result of a system call */
}__attribute__((packed)) CELL_STACK_FRAME_t;
#endif

#define STACK_FRAME_OVERHEAD    16  /* size of minimum stack frame */

/* Size of stack frame allocated when calling signal handler. */
#define __SIGNAL_FRAMESIZE  64

#define instruction_pointer(regs) ((regs)->nip)
#define user_mode(regs) (((regs)->msr & MSR_PR) != 0)

/*
 * Offsets used by 'ptrace' system call interface.
 * These can't be changed without breaking binary compatibility
 * with MkLinux, etc.
 */
#define PT_R0   0
#define PT_R1   1
#define PT_R2   2
#define PT_R3   3
#define PT_R4   4
#define PT_R5   5
#define PT_R6   6
#define PT_R7   7
#define PT_R8   8
#define PT_R9   9
#define PT_R10  10
#define PT_R11  11
#define PT_R12  12
#define PT_R13  13
#define PT_R14  14
#define PT_R15  15
#define PT_R16  16
#define PT_R17  17
#define PT_R18  18
#define PT_R19  19
#define PT_R20  20
#define PT_R21  21
#define PT_R22  22
#define PT_R23  23
#define PT_R24  24
#define PT_R25  25
#define PT_R26  26
#define PT_R27  27
#define PT_R28  28
#define PT_R29  29
#define PT_R30  30
#define PT_R31  31

#define PT_NIP  32
#define PT_MSR  33
#define PT_ORIG_R3 34
#define PT_CTR  35
#define PT_LNK  36
#define PT_XER  37
#define PT_CCR  38
#define PT_MQ   39

#define PT_FPR0 48  /* each FP reg occupies 2 slots in this space */
#define PT_FPR31 (PT_FPR0 + 2*31)
#define PT_FPSCR (PT_FPR0 + 2*32 + 1)

#endif
